Use of nanomaterials in secondary electrical insulation coatings

ABSTRACT

Use of the barrier property effect of nanomaterials to improve the electrical insulation resistance, corrosion protection and bond strength properties of electromagnetic devices. The beneficial effects are realized with nanomaterial loadings of 1-20%, and preferably between 1-5%, parts by weight of coating resins. Nanomaterials include, but are not limited to, silica, alumina, zirconia, and antimony pentoxide, which are dispersed either directly into a coating, or pre-dispersed in a carrier appropriate to the solvent of the resin system. Resulting formulations benefit from the fact anti-settling agents need not be incorporated into the resin to keep the inorganic material suspended. Also, the rheology of the resin system is not significantly altered which would otherwise affect processing of the resins for their intended applications.

CROSS REFERENCE TO RELATED APPLICATIONS

None

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

N/A

BACKGROUND OF THE INVENTION

This invention relates to electromagnetic devices; and, more particularly, to the use of nanomaterials in insulation coatings for these devices.

Organic resin compositions are used as coatings for the mechanical, electrical and environmental-resistance they impart to electromagnetic devices. The coatings provide a mechanical strength, electrical insulation, and environmental protection for improved long-term durability of the devices, as well as increasing the quality of the final product. Some of these beneficial properties can be improved by the addition of inorganic fillers such as silica, calcium carbonate, alumina, etc. However, a problem with the current state of this technology is that the inorganic materials used in the coatings do not always remain suspended in the coatings, resulting in a non-homogeneous mixture. When the coatings are applied to the devices, areas of weakness result that, in turn, can cause failure of a device.

This current state of the art raises several issues related to the handling of the coating, its agitation (to produce homogeneity before application) and its pumping, and concerns about the homogeneity of both the applied liquid and the resulting cured film. Prior approaches employed to address these problems have focused on the use of fumed silica and other materials used as suspension agents for the inorganic materials. But, in some instances, use of these agents produce undesirable results because of rheological changes which occur and cause inconsistencies in the applied coatings.

BRIEF SUMMARY OF THE INVENTION

The present invention is directed to coatings utilizing the barrier property effect of nanomaterials to improve the electrical insulation resistances and corrosion protection of electromagnetic devices; without the coating having the non-homogeneity problems described above. These beneficial effects are realized with nanomaterial loadings of 1-20%, and preferably between 1-5%, parts by weight to the coating resin. The materials used include, but are not limited to, silica, alumina, zirconia, and antimony pentoxide. These are dispersed either directly into a coating, or pre-dispersed in a carrier appropriate to the solvent of the resin system being modified. The resulting formulations benefit from the fact anti-settling agents need not be incorporated in the mixture to keep the inorganic material suspended in the coating. A further benefit is that the rheology of the resin system is not significantly altered which would otherwise affect the processing of the resins in their intended applications.

Other objects and features will be in part apparent and in part pointed out hereinafter.

DETAILED DESCRIPTION OF INVENTION

The following detailed description illustrates the invention by way of example and not by way of limitation. This description will clearly enable one skilled in the art to make and use the invention, and describes several embodiments, adaptations, variations, alternatives and uses of the invention, including what we presently believe is the best mode of carrying out the invention. As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

In accordance with the present invention, barrier property effects of nanomaterials are used to improve the electrical insulation resistance and corrosion protection properties of electromagnetic devices coated with a coating resin incorporating the nanomaterials, while simultaneously avoiding the homogeneity problems previously discussed. To achieve these desired results, inorganic materials in the 1-150 nanometer range are used in formulating the coating resins applied to the devices. By contrast, the size of inorganic particles in current, state-of-the-art filler systems is on the order of 1500 nanometers. Suitable chemistries include, but not limited to, unsaturated polyesters, epoxies, urethanes, waterborne polyesters, epoxy emulsions, organic solvent borne alkyds, acrylated urethanes, acrylated epoxies, acrylated polyols, and acrylated vegetable oils. The desired effects are achieved using nanomaterial loadings of between 1-20% parts by weight, and preferably between 1-5% parts by weight, of a nanomaterial to the resin. Nanomaterials include, but are not limited to, silica, alumina, zirconia, and antimony pentoxide. Those skilled in the art will understand that the resulting coatings can be tailored to meet specific performance requirements for a device by the inclusion of an appropriate amount of a nanomaterial or a combination of nanomaterials. One important advantage of the coatings of the present invention is that the rheology of the resin system is not significantly altered; although, in some instances, there is an increase in the viscosity of the resulting mixture. Overall, though, processing of the resins for their intended applications is not materially affected.

With respect to the use of nanomaterials, their small particle size means that a given amount of material is more evenly distributed throughout the resin, creating a more tortuous path which is harder for corrosive agents to penetrate. Further, the particles being in close proximity to each other, promotes dissipation of any electrical charge, thereby leading to improved electrical properties of a device.

The barrier effect resulting from use of the nanomaterials produces significant results in the coatings made in accordance with the invention. For example, the improved electrical and corrosion resistance properties referred to above occur even though lower amounts of inorganic nanomaterials are used in producing a coating using other inorganic filler materials. The coatings also have an improved abrasion resistance, even though, again, lower amounts of inorganic nanomaterials are used in the coating. Third, some of the new coatings may have a lower viscosity than current coatings. All of these features serve to provide greater flexibility in processing options for the coating, while achieving desired performance characteristics for the completed device.

During preparation, the nanomaterials are dispersed directly into a coating. Or, alternately, the nanomaterial is pre-dispersed in a carrier appropriate to the solvent of the resin system being modified. A significant advantage of the resulting formulations is that anti-settling or suspension agents such as fumed silica, etc., do not need to be added to the resulting solution to keep the nanomaterial suspended in it. A second advantage is that homogeneity of the coating mixture is achieved and maintained with a minimal amount of agitation of the mixture as compared to that required for conventional coatings having inorganic fillers.

Nanomaterial modified organic coatings are applied using the same processes currently used in the industry. These include, but are not limited to, dip and bake, trickle, vacuum/pressure impregnation, roll through, spray, and vacuum impregnation. In addition, coatings made in accordance with the present invention are cured using currently available methods such as gas-fired ovens, resistance heating, infrared radiation heating, chemical catalyzation and ultraviolet (UV) radiation curing. Regardless of the method of application, coatings incorporating a nanomaterial more readily flow into the areas of the electromagnetic device being coated, since the inorganic nanomaterial is of a smaller particle size than the organic filler materials used in conventional coatings. Further, with respect to UV curing processes, coatings made in accordance with the present invention have been found to exhibit an improved optical clarity. This facilitates use of UV induced curing processes that cannot now be used because of the presence of organic fillers in current coatings.

The following discussion refers to Tables 1 and 2. TABLE 1 Standard Filled UPE System I System II Commercial 70 99 97 Polyester A Silica, 2.9 microns 30 0 0 Nanoalumina, 50 0 1 3 nanometers

TABLE 2 Standard WBPE System III Commercial Waterborne 100 97 Polyester Nanoalumina, 150 0 3 nanometers

Referring to Table 1, a standard filled unsaturated polyester (UPE) coating was prepared by dispersing 30 parts by weight (pbw) of silica in 70 pbw of a UPE resin using a high speed dispersion process, until the resulting mixture was homogeneous. In addition, two nano-modified UPE samples were prepared. The first, referred to as System I in Table 1, was prepared by adding 1 pbw of a nanomaterial to 99 pbw of the UPE resin and then mixing until dispersed. The second, referred to as System II in Table 1, was prepared by adding 3 pbw of the nanomaterial to 97 pbw of the UPE resin and again mixing until well dispersed.

Referring to Table 2, a nano-modified waterborne polyester (WBPE) coating, referred to as System III in the Table, was prepared by adding 3 pbw of a nanomaterial to 97 pbw of WBPE and mixing until well dispersed. The WBPE component of the system comprised alumina predispersed in water (Nanophase).

Physical properties of the representative formulations are listed in Table 3. TABLE 3 Standard Standard UPE w/ UPE Filled UPE Nanomaterial Inorganic Loading, % 0 30 3 Viscosity, 25° C., Cp 100-200 150-250 150-400 Density, 25° C. 1.09 1.30 1.09

Test results of formulation examples are listed in Tables 4 and 5 in which corrosion and settling ratings of 1-10 for corrosion are based on 1 being worst, and 10 best. TABLE 4 Standard Filled UPE System I System II Pulse Endurance, 3200 4 >6000 minutes Helical coil bond 23 15 20 strength, lbs Dielectric strength, 3000 3500 4300 vpm Corrosion 6 Under test 8 Settling 1 9 9

TABLE 5 Standard WBPE System III Pulse Endurance, minutes 28 56 Helical coil bond strength, lbs 12 12 Dielectric strength, vpm 5400 3100 Corrosion 10 10 Settling 10 9

In view of the above, it will be seen that the several objects and advantages of the present invention have been achieved and other advantageous results have been obtained. 

1. An improved coating for an electromagnetic device to improve the electrical insulation resistance and corrosion protection properties of the device comprising: a commercially available coating resin material; and, a nanomaterial added to the resin material by between approximately 1-5% part by weight of the nanomaterial, the resin material and nanomaterial being mixed together to obtain a homogeneous coating mixture which is applied to the electromagnetic device, inclusion of the nanomaterial in the mixture eliminating the need for anti-settling agents to keep the nanomaterial suspended in the mixture, and inclusion of the nanomaterial in the mixture further not significantly altering the rheology of the coating for use in a particular application.
 2. The improved coating of claim 1 in which the nanomaterial is an inorganic material in the range of 1-150 nanometers.
 3. The improved coating of claim 2 in which the nanomaterial comprises one of silica, alumina, zirconia, or antimony pentoxide.
 4. The improved coating of claim 1 in which between approximately 1-20% part by weight of the nanomaterial is added to the resin material.
 5. The improved coating of claim 1 in which the resin material is a standard filled unsaturated polyester (UPE) coating material.
 6. The improved coating of claim 1 in which the resin material is a water borne polyester (WBPE) coating material.
 7. The improved coating material of claim 1 in which the nanomaterial is dispersed directly into the resin material.
 8. The improved coating material of claim 1 in which the nanomaterial is pre-dispersed into a carrier appropriate for the resin material with which the nanomaterial is mixed.
 9. The improved coating of claim 1 in which the barrier effect resulting from use of the nanomaterial improves electrical and corrosion resistance properties of the coating using lower amounts of the nanomaterial than a coating produced using an inorganic filler material.
 10. The improved coating of claim 9 in which the barrier effect resulting from use of the nanomaterial further improves the abrasion resistance of the coating.
 11. The improved coating of claim 10 in which the barrier effect resulting from use of the nanomaterial produces a coating having a relatively low viscosity thereby providing flexibility in processing options for the coating.
 12. A process for producing a coating for an electromagnetic device to improve the electrical insulation resistance-, and corrosion protection properties of the device comprising: formulating a coating resin using a commercially available resin material; adding to the resin material between approximately 1-5% part by weight of a nanomaterial; mixing the resin material and nanomaterial together to obtain a resultant, homogeneous coating mixture, inclusion of the nanomaterial in the mixture eliminating the need for anti-settling agents to keep the nanomaterial suspended in the mixture; and, applying the resultant mixture to the electromagnetic device.
 13. The process of claim 12 in which between approximately 1-20% part by weight of the nanomaterial is added to the resin material.
 14. The process of claim 13 in which the nanomaterial is an inorganic material in the range of 1-150 nanometers and comprising one of silica, alumina, zirconia, or antimony pentoxide.
 15. The process of claim 14 in which the resin material is a standard filled unsaturated polyester (UPE) coating material.
 16. The process of claim 15 in which the resin material is a water borne polyester (WBPE) coating material.
 17. The process of claim 12 in which the nanomaterial is dispersed directly into the resin material.
 18. The process of claim 12 in which the nanomaterial is pre-dispersed into a carrier appropriate for the resin material with which the nanomaterial is mixed. 